2002 MAZDA 6 key

K2–134
ON-BOARD DIAGNOSTIC
End Of Sie
4INSPECT TERMINAL CONDITION
•Turn ignition key to OFF.
•Disconnect terminal component No.2.
•Inspect bent terminals.
•Is there any malfunction?Yes Repair or replace terminals, then go to Step 9.
•If terminals cannot be repaired, replace harness, then
go to Step 9.
No Go to next step.
5INSPECT TFT SENSOR CIRCUIT
•Turn ignition key to ON (engine OFF).
•Verify if TCM terminal voltage changes to 4.9 V
or above when terminal component No.2
disconnected.
•Does TCM terminal voltage change?Yes Go to next step.
No Go to Step 8.
6INSPECT COUPLER COMPONENT (8-PIN)
TERMINALS CONDITION
•Turn ignition key to OFF.
•Disconnect coupler component (8-pin)
connector.
•Inspect bent coupler component (8-pin)
terminals.
•Is there any malfunction?Yes Repair or replace connector and/or terminal.
No Go to next step.
7INSPECT COUPLER COMPONENT (8-PIN)
CIRCUIT FOR SHORT TO GROUND
•Check continuity between coupler component
(8-pin) terminals (part-side) and body ground.
—I and body ground
—J and body ground
•Is there any continuity?Yes Replace TFT sensor, then go to Step 9.
No Repair or replace coupler component, then go to Step 9.
8INSPECT TERMINAL COMPONENT NO.2 (8-
PIN) CIRCUIT FOR SHORT TO GROUND
•Turn ignition key to OFF.
•Check continuity between terminal component
No.2 terminal G (harness-side) and body
ground.
•Is there any continuity?Yes Repair or replace harness, then go to next step.
No Go to next step.
9VERIFY TROUBLESHOOTING OF DTC P0712
COMPLETED
•Make sure to reconnect all disconnected
connectors.
•Clear DTC from memory using WDS or
equivalent.
•Drive vehicle under following condition for 150
seconds or more.
—Vehicle speed (VSS PID): 20 km/h {12
mph}
•Is same DTC present?Yes Replace TCM, then go to next step.
(See K2–96 TCM REMOVAL/INSTALLATION.)
No Go to next step.
10VERIFY AFTER REPAIR PROCEDURE
•Perform “After Repair Procedure”.
(See K2–124 AFTER REPAIR PROCEDURE.)
•Is there any DTC present?Yes Go to applicable DTC inspection.
No Troubleshooting completed. STEP INSPECTION ACTION

ON-BOARD DIAGNOSTIC
K2–135
K2
DTC P0713A6E577018901209
Diagnostic procedure
DTC P0713 Transaxle fluid temperature (TFT) sensor circuit malfunction (open circuit)
DETECTION
CONDITION•Vehicle speed is 20 km/h {12.4 mph} or greater, and signal from TFT sensor is 2.4 V or above for 300
seconds or more.
Diagnostic support note:
•This is a continuous monitor (CCM).
•MIL illuminates if TCM detects the above malfunction conditions in two consecutive drive cycles.
•PENDING CODE is available.
•FREEZE FRAME DATA is available.
•AT warning light indication.
•DTC is stored in TCM memory.
POSSIBLE
CAUSE•TFT sensor malfunction.
•Open circuit between TFT sensor and TCM terminal 1F
•Open circuit between TFT sensor and TCM terminal 1B
•Damaged connectors between TFT sensor and TCM
•TCM malfunction
STEP INSPECTION ACTION
1VERIFY FREEZE FRAME DATA HAS BEEN
RECORDED
•Has FREEZE FRAME PID DATA been
recorded?Yes Go to next step.
No Record FREEZE FRAME PID DATA on repair order, then
go to next step.
2VERIFY RELATED REPAIR INFORMATION
AVAILABILITY
•Check for related Service Bulletins and/or on-
line repair information availability.
•Is any related repair information available?Yes Perform repair or diagnosis according to available repair
information.
•If vehicle is not repaired, go to next step.
No Go to next step.
3VERIFY CURRENT INPUT SIGNAL STATUS - IS
CONCERN INTERMITTENT OR CONSTANT?
•Turn ignition key to OFF.
•Connect voltmeter to TCM terminal 1F
•Turn ignition key to ON (engine OFF).
•Are TCM terminal voltage within 0.2—4.9 V?Yes Go to intermittent concern troubleshooting procedure.
(See section F1.)
No Go to next step.
AT XTCM
IG1F
1B
JH
TFT SENSOR
TCM
HARNESS SIDE CONNECTORTERMINAL COMPONENT NO.2(8-PIN)
HARNESS SIDE CONNECTOR
COUPLER COMPONENT NO.2(8-PIN)
PART SIDE CONNECTOR

K2–136
ON-BOARD DIAGNOSTIC
End Of Sie
4INSPECT TERMINAL COMPONENT NO.2 (8-
PIN) FOR POOR CONNECTION
•Turn ignition key to OFF.
•Inspect terminal component No.2 (8-pin)
connection.
•Disconnect terminal component No.2 (8-pin).
•Check for poor connection (damaged, pulled-
out terminals, corrosion etc.).
•Are connector and terminals okay?Yes Go to next step.
No Repair or replace connector and/or terminal, then go to
Step 11.
5INSPECT TFT SENSOR CIRCUIT
•Connect voltmeter to TCM terminal 1F.
•Turn ignition key to ON (engine OFF).
•Connect between terminal component No.2 (8-
pin) terminal H and G (harness-side) using
jumper wire.
•Verify if TCM terminal voltage changes to 0.2 V
or below.
•Does TCM terminal voltage change?Yes Go to next step.
No Go to Step 8.
6INSPECT COUPLER COMPONENT
CONNECTOR CONNECTION FOR POOR
CONNECTION
•Turn ignition key to OFF.
•Remove control valve body cover.
•Disconnect coupler component connector.
•Check for poor connection (damaged, pulled-
out terminals, corrosion, etc.).
•Are terminals okay?Yes Go to next step.
No Repair or replace connector and/or terminal, then go to
Step 11.
7INSPECT COUPLER COMPONENT CIRCUIT
FOR OPEN CIRCUIT
•Check continuity between coupler component
(8-pin) terminals I and J (part-side).
•Is there continuity?Yes Repair or replace terminal component No.2 (8-pin).
No Replace TFT sensor, then go to Step 11.
(See K2–85 TRANSAXLE FLUID TEMPERATURE (TFT)
SENSOR REMOVAL/INSTALLATION.)
8INSPECT TCM CONNECTOR FOR POOR
CONNECTION
•Turn ignition key to OFF.
•Disconnect TCM connector.
•Check for poor connection (damaged, pulled-
out terminals, corrosion, etc.).
•Are terminals okay?Yes Go to next step.
No Repair terminals, then go to Step 11.
9INSPECT HARNESS FOR OPEN CIRCUIT
•Disconnect terminal component No.2 (8-pin)
•Connect the TCM connector.
•Turn ignition key to ON (engine OFF).
•Inspect voltage at terminal component No.2 (8-
pin) terminal G (harness-side).
•Is voltage 5 V?Yes Go to next step.
No Repair or replace harness, then go to Step 11.
10INSPECT TERMINAL COMPONENT NO.2 (8-
PIN) CIRCUIT FOR OPEN CIRCUIT
•Turn ignition key to OFF.
•Check continuity between terminal component
No.2 (8-pin) terminal H (harness-side) and
body ground.
•Is there continuity?Yes Go to next step.
No Repair or replace harness, then go to next step.
11VERIFY TROUBLESHOOTING OF DTC P0713
COMPLETED
•Make sure to reconnect all disconnected
connectors.
•Clear DTC from memory using WDS or
equivalent.
•Drive vehicle for 150 seconds or more.
•Is same DTC present?Yes Replace TCM, then go to next step.
(See K2–96 TCM REMOVAL/INSTALLATION.)
No Go to next step.
12VERIFY AFTER REPAIR PROCEDURE
•Perform “After Repair Procedure”.
(See K2–124 AFTER REPAIR PROCEDURE.)
•Is there any DTC present?Yes Go to applicable DTC inspection.
No Troubleshooting completed. STEP INSPECTION ACTION

K2–138
ON-BOARD DIAGNOSTIC
Diagnostic procedure
STEP INSPECTION ACTION
1VERIFY FREEZE FRAME DATA HAS BEEN
RECORDED
•Has FREEZE FRAME PID DATA been
recorded?Yes Go to next step.
No Record FREEZE FRAME PID DATA on repair order, then
go to next step.
2VERIFY RELATED REPAIR INFORMATION
AVAILABILITY
•Check for related Service Bulletins and/or on-
line repair information availability.
•Is any related repair information available?Yes Perform repair or diagnosis according to available repair
information.
•If vehicle is not repaired, go to next step.
No Go to next step.
3INSPECT TERMINAL COMPONENT NO.2 (8-
PIN) CONNECTOR FOR POOR CONNECTION
•Turn ignition key to OFF.
•Disconnect terminal component No.2 (8-pin)
connector.
•Check for poor connection (damaged, pulled-
out terminals, corrosion, etc.).
•Are terminals okay?Yes Go to next step.
No Repair or replace terminals, then go to Step 12.
4INSPECT INPUT/TURBINE SPEED SENSOR
RESISTANCE
•Measure resistance between terminal
component No.2 (8-pin) (transaxle case side).
•Is resistance within 513—627 ohms between
terminal component No.2 (8-pin) terminal E
and F (transaxle case side)?Yes Go to next step.
No Go to Step 8
5INSPECT TCM CONNECTOR FOR POOR
CONNECTION
•Disconnect TCM connector.
•Check for poor connection (damaged, pulled-
out terminals, corrosion, etc.).
•Are terminals okay?Yes Go to next step.
No Repair terminals, then go to Step 12.
6INSPECT TERMINAL COMPONENT NO.2 (8-
PIN) CIRCUIT FOR OPEN
•Check terminal component No.2 (8-pin)
terminals (harness-side) and TCM terminals
(harness-side).
—F and 2F
—E and 1N
•Is there continuity?Yes Go to next step.
No Repair or replace harness, then go to Step 12.
7INSPECT TERMINAL COMPONENT NO.2 (8-
PIN) CIRCUIT FOR SHORT TO GROUND
•Check terminal component No.2 (8-pin)
terminal (harness-side) and body ground.
—F and body ground
—E and body ground
•Is there any continuity?Yes Repair or replace harness, then go to Step 12.
No Go to Step 12.
8INSPECT COUPLER COMPONENT (8-PIN)
CONNECTOR FOR POOR CONNECTION
•Disassemble the control valve body cover.
•Disconnect coupler component (8-pin)
connector.
•Check for poor connection (damaged, pulled-
out terminals, corrosion, etc.).
•Are terminals okay?Yes Go to next step.
No Repair terminals, then go to Step 12.
9INSPECT INPUT/TURBINE SPEED SENSOR
RESISTANCE
•Measure resistance between coupler
component (8-pin) (transaxle case side).
•Is resistance within 513—527 ohms between
coupler component (8-pin) terminal B and A
(part side)?Yes Repair or replace terminal component, then go to Step 12.
No Go to next step.

K2–140
ON-BOARD DIAGNOSTIC
Diagnostic procedure
STEP INSPECTION ACTION
1VERIFY FREEZE FRAME DATA HAS BEEN
RECORDED
•Has FREEZE FRAME PID DATA been
recorded?Yes Go to next step.
No Record FREEZE FRAME PID DATA on repair order, then
go to next step.
2VERIFY RELATED REPAIR INFORMATION
AVAILABILITY
•Check for related Service Bulletins and/or on-
line repair information availability.
•Is any related repair information available?Yes Perform repair or diagnosis according to available repair
information.
•If vehicle is not repaired, go to next step.
No Go to next step.
3INSPECT TERMINAL COMPONENT NO.2 (8-
PIN) CONNECTOR FOR POOR CONNECTION
•Turn ignition key to OFF.
•Disconnect terminal component No.2 (8-pin)
connector.
•Check for poor connection (damaged, pulled-
out terminals, corrosion, etc.).
•Are terminals okay?Yes Go to next step.
No Repair or replace terminals, then go to Step 12. DTC P0720 Vehicle speedometer sensor (VSS) malfunction (open/short)
AT X
H
F
B1V A
1M
A BTCM
TCM
HARNESS SIDE CONNECTORTERMINAL COMPONENT
NO.2(8-PIN)
HARNESS SIDE CONNECTOR
COUPLER COMPONENT
(8-PIN)
PART SIDE CONNECTORVSS
HARNESS SIDE CONNECTOR

K2–142
ON-BOARD DIAGNOSTIC
End Of SieDTC P0740A6E577018901212
Diagnostic procedure
12VERIFY TROUBLESHOOTING OF DTC P0720
COMPLETED
•Make sure to reconnect all disconnected
connectors.
•Clear DTC from memory using WDS or
equivalent.
•Drive vehicle with vehicle speed 40 km/h {25
mph} or above for 2 second or more
•Is same DTC present?Yes Replace TCM, then go to next step.
(See K2–96 TCM REMOVAL/INSTALLATION.)
No Go to next step.
13VERIFY AFTER REPAIR PROCEDURE
•Perform “After Repair Procedure”.
(See K2–124 AFTER REPAIR PROCEDURE.)
•Is there any DTC present?Yes Go to applicable DTC inspection.
No Troubleshooting completed. STEP INSPECTION ACTION
DTC P0740 TCC system malfunction
DETECTION
CONDITION•RPM difference between crankshaft (engine speed signal) and reverse clutch drum (input/turbine speed
sensor signal) exceeds the pre-programmed value.
Diagnostic support note:
•This is continuous monitor (CCM).
•MIL illuminates if TCM detects the above malfunction conditions in two consecutive drive cycles.
•PENDING CODE is available.
•FREEZE FRAME DATA is available.
•AT warning light does not indication.
•DTC is stored in TCM memory.
POSSIBLE
CAUSE•ATF level low.
•Deteriorated ATF.
•TCC solenoid valve and pressure control solenoid stuck.
•Line pressure low.
•Oil pump malfunction.
•Control valve stuck
•Torque convert clutch malfunction
•TCM malfunction.
STEP INSPECTION ACTION
1VERIFY FREEZE FRAME DATA HAS BEEN
RECORDED
•Has FREEZE FRAME PID DATA been
recorded?Yes Go to next step.
No Record FREEZE FRAME PID DATA on repair order, then
go to next step.
2VERIFY RELATED REPAIR INFORMATION
AVAILABILITY
•Check for related Service Bulletins and/or on-
line repair information availability.
•Is any related repair information available?Yes Perform repair or diagnosis according to available repair
information.
•If vehicle is not repaired, go to next step.
No Go to next step.
3CHECK ATF CONDITION
•Turn ignition key to OFF.
•Check ATF condition.
—Clear red: Normal
—Milky: Water mixed in fluid
—Reddish brown: Deteriorated ATF
•Is it okay?
(See K2–78 Automatic Transaxle Fluid (ATF)
Condition Inspection.)Yes Go to next step.
No If ATF color milky or reddish brown, replace ATF, then go to
Step 5.
(See K2–80 AUTOMATIC TRANSAXLE FLUID (ATF)
REPLACEMENT.)
4CHECK ATF LEVEL
•Start engine.
•Warm up ATX.
•Is ATF level within specification?
(See K2–79 Automatic Transaxle Fluid (ATF)
Level Inspection.)Yes Go to next step.
No Adjust ATF level, then go to Step 9.
(See K2–79 Automatic Transaxle Fluid (ATF) Level
Inspection.)

ON-BOARD DIAGNOSTIC
K2–143
K2
End Of Sie
5INSPECT LINE PRESSURE
•Start engine.
•Measure line pressure.
Specification
—D range, M (2GR) range
Idle: 290—490 kPa {3.0—4.9 kgf/cm
2, 43—69
psi}
Stall: 1,550—1,750 kPa {15.8—17.8 kgf/cm
2,
225—254 psi}
—M (1GR) range, R position
Idle:550—750 kPa {5.6—7.6 kgf/cm
2, 80—
109 psi}
Stall: 1,550—1,750 kPa {15.8—17.8 kgf/cm
2,
225—254 psi}
•Is line pressure within specification?
(See K2–72 Line Pressure Test.)Yes Go to next step.
No All ranges: Replace or overhaul oil pump or control valve
body, then go to Step 10.
Any ranges: Replace or overhaul automatic transaxle, then
go to Step 10.
(See K2–99 AUTOMATIC TRANSAXLE AND TRANSFER
REMOVAL/INSTALLATION.)
6CLICK TEST OF SOLENOID VALVES
•Turn ignition key to OFF.
•Disconnect terminal component No.1(12-pin).
•Apply battery voltage to terminal component
No.1 (12-pin) terminals (transaxle case side).
—TCC solenoid vale: B
—Pressure control solenoid: D
•Verify the click sounds of TCC solenoid valve
and pressure control solenoid.
•Are there click sounds?Yes Go to next step.
No Replace TCC solenoid valve or pressure control solenoid,
then go to Step 10.
(See K2–105 CONTROL VALVE BODY REMOVAL/
INSTALLATION.)
7INSPECT DIFFERENCE BETWEEN ENGINE
SPEED AND TURBINE SPEED
•Inspect difference between engine speed and
turbine speed during TCC operation in 5GR
•Drive vehicle under following condition
—TR switch position: D range
—Gear position: 5GR
—TCC solenoid valve: ON
•Is difference between engine speed (RPM PID)
and turbine speed okay?
Difference
Below 99 rpmYes Go to Step
No Go to next step.
8INSPECT OPERATION OF EACH VALVE AND
EACH SPRING
•Remove control valve body.
•Disassemble control valve body.
•Is each valve operation okay and is return
spring okay?Yes Replace torque converter, then go to next step.
No Replace control valve body, then go to next step.
(See K2–105 CONTROL VALVE BODY REMOVAL/
INSTALLATION.)
9VERIFY TROUBLESHOOTING OF DTC P0740
COMPLETED
•Make sure to reconnect all disconnected
connectors.
•Clear DTC from memory using WDS or
equivalent.
•Start engine.
•Warm up ATX.
•Drive vehicle under following condition for 10
seconds or more.
—Vehicle speed (VSS PID): Within 10—87
km/h {6—54 mph}
—Gear position: 5GR
—TR switch position: D range
—TCC solenoid valve: ON
•Is there pending code present?Yes Replace TCM, then go to next step.
(See K2–96 TCM REMOVAL/INSTALLATION.)
No Go to next step.
10VERIFY AFTER REPAIR PROCEDURE
•Perform “After Repair Procedure”.
(See K2–124 AFTER REPAIR PROCEDURE.)
•Is there any DTC present?Yes Go to applicable DTC inspection.
No Troubleshooting completed. STEP INSPECTION ACTION

ON-BOARD DIAGNOSTIC
K2–145
K2
Diagnostic procedure
STEP INSPECTION ACTION
1VERIFY FREEZE FRAME DATA HAS BEEN
RECORDED
•Has FREEZE FRAME PID DATA been
recorded?Yes Go to next step.
No Record FREEZE FRAME PID DATA on repair order, then
go to next step.
2VERIFY RELATED REPAIR INFORMATION
AVAILABILITY
•Check for related Service Bulletins and/or on-
line repair information availability.
•Is any related repair information available?Yes Perform repair or diagnosis according to available repair
information.
•If vehicle is not repaired, go to next step.
No Go to next step.
3INSPECT TERMINAL COMPONENT NO.1 (12-
PIN) FOR POOR CONNECTION
•Turn ignition key to OFF.
•Disconnect terminal componentNo.1 (12-pin).
•Check for poor connection (damaged, pulled-
out, terminals, corrosion, etc.).
•Are terminals okay?Yes Go to next step.
No Repair or replace terminals, then go to Step 13.
4INSPECT RESISTANCE
•Check resistance between terminal component
No.1 (12-pin) terminal H (transaxle case side)
and body ground.
•Is resistance within 12—13.2 ohms?
(See K2–88 SOLENOID VALVE INSPECTION.)Yes Go to Step 9.
No Go to next step.
5INSPECT COUPLER COMPONENT (10-PIN)
FOR POOR CONNECTION
•Disconnect coupler component (10-pin)
connector.
•Check for poor connection (damaged, pulled-
out, terminals, corrosion, etc.).
•Is terminal okay?Yes Go to next step.
No Repair or replace terminal, then go to Step 13.
6INSPECT RESISTANCE
•Check resistance between coupler component
(10-pin) terminal C (part side) and body
ground.
•Is resistance within 12—13.2 ohms?
(See K2–88 SOLENOID VALVE INSPECTION.)Yes Repair or replace terminal component No.1 (12-pin), then
go to Step 13.
No Go to next step.
7INSPECT TCC SOLENOID VALVE
CONNECTOR FOR POOR CONNECTION
•Disconnect TCC solenoid valve connector.
•Check for poor connection (damaged, pulled-
out, terminals, corrosion, etc.).
•Is terminal okay?Yes Go to next step.
No Repair or replace terminal, then go to Step 13.
8INSPECT RESISTANCE
•Check resistance between TCC solenoid valve
connector (part side) terminal A and body
ground.
•Is resistance within 12—13.2 ohms?
(See K2–88 SOLENOID VALVE INSPECTION.)Yes Repair or replace coupler component (10-pin), then go to
Step 13.
No Verify TCC solenoid valve installation.
•If TCC solenoid valve is installed correctly, replace TCC
solenoid valve, then go to Step 13.
(See K2–90 SOLENOID VALVE REMOVAL/
INSTALLATION.)
9INSPECT TCM CONNECTOR FOR POOR
CONNECTION
•Disconnect TCM connector.
•Check for poor connection (damaged, pulled-
out, terminals, corrosion, etc.).
•Are terminals okay?Yes Go to next step.
No Repair terminals, then go to Step 13.
10INSPECT TERMINAL COMPONENT NO.1 (12-
PIN) CIRCUIT FOR OPEN CIRCUIT
•Check continuity between TCM terminal 2S
(harness-side) and terminal component No.1
(12-pin) terminal H (harness-side).
•Is there continuity between terminals?Yes Go to next step.
No Repair or replace harness, then go to Step 13.